Ok well im selling my 4.6 to buy another 5.0, the guy is selling his 87 lx that im going to buy. He has a P600B procharger that he is throwing in that is not installed. I was spinning the charger and it felt like it was grinding a little or something like gears meshing, and if i remember correctly my vortech didnt do this as bad. Is this normal on Prochargers or is there something wrong with this headunit? The guy is selling the car/charger for 5,000 and i dont really want a charger that i will have to send in to get rebuilt. thanks